Quantitative mixing rules for downhole oil-based mud contamination monitoring in real time using multiple sensors

Zuo, Julian Y.; Gisolf, Adriaan; Wang, Kang; Dubost, Francois Xavier; Pfeiffer, Thomas; Dumont, Hadrien; Mishra, Vinay Kumar; Chen, Li; Agarwal, Abhishek; Ayán, Carlos; Mullins, Oliver C.

doi:10.1016/j.petrol.2015.11.025

Cited by 9 publications

(1 citation statement)

References 19 publications

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“…Hence, this spectral region is highly informational for chemical composition analysis of crude oil samples. A prominent example is downhole optical fluid analyzer utilized in oil and gas exploration for in situ compositional analysis of reservoir fluids. , As mentioned earlier, the inherent problem of NIR measurements is the weaker absorption of these modes compared to the corresponding fundamental modes in the mid-IR region, as well as the inferior detector sensitivity. Hence, SENIRA has the potential in mitigating such limitations.…”

Section: Lspr Shift Due To Refractive Index Changesmentioning

confidence: 99%

Simultaneous Chemical and Refractive Index Sensing in the 1–2.5 μm Near-Infrared Wavelength Range on Nanoporous Gold Disks

et al. 2016

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Near-infrared (NIR) absorption spectroscopy provides molecular and chemical information based on overtones and combination bands of the fundamental vibrational modes in the infrared wavelengths. However, the sensitivity of NIR absorption measurement is limited by the generally weak absorption and the relatively poor detector performance compared to other wavelength ranges. To overcome these barriers, we have developed a novel technique to simultaneously obtain chemical and refractive index sensing in 1-2.5 μm NIR wavelength range on nanoporous gold (NPG) disks, which feature high-density plasmonic hot-spots of localized electric field enhancement. For the first time, surface-enhanced near-infrared absorption (SENIRA) spectroscopy has been demonstrated for high sensitivity chemical detection. With a self-assembled monolayer (SAM) of octadecanethiol (ODT), an enhancement factor (EF) of up to ∼10(4) has been demonstrated for the first C-H combination band at 2400 nm using NPG disk with 600 nm diameter. Together with localized surface plasmon resonance (LSPR) extinction spectroscopy, simultaneous sensing of sample refractive index has been achieved for the first time. The performance of this technique has been evaluated using various hydrocarbon compounds and crude oil samples.

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Section: Lspr Shift Due To Refractive Index Changesmentioning

confidence: 99%